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Note 10 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Product sales, net | $ 1,648,368 | $ 2,425,738 | $ 4,349,270 | $ 5,350,445
Dental Segment [Member] |  |  |  |
Product sales, net | 1,609,768 | 2,404,738 | 4,303,120 | 5,258,395
Medical Segment [Member] |  |  |  |
Product sales, net | 38,600 | 21,000 | 46,150 | 92,050
Domestic [Member] |  |  |  |
Product sales, net | 997,782 | 1,000,642 | 1,949,019 | 1,997,700
Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 979,182 | 1,000,642 | 1,922,869 | 1,989,550
Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 18,600 | 0 | 26,150 | 8,150
Rest of World [Member] |  |  |  |
Product sales, net | 650,586 | 899,760 | 2,040,287 | 2,320,409
Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 630,586 | 878,760 | 2,020,287 | 2,236,509
Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 20,000 | 21,000 | 20,000 | 83,900
CHINA |  |  |  |
Product sales, net | 0 | 525,336 | 359,964 | 1,032,336
CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 0 | 525,336 | 359,964 | 1,032,336
CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Instruments [Member] | Domestic [Member] |  |  |  |
Product sales, net | 155,028 | 178,752 | 277,996 | 354,768
Instruments [Member] | Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 155,028 | 178,752 | 277,996 | 354,768
Instruments [Member] | Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Instruments [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 160,814 | 172,088 | 614,374 | 597,841
Instruments [Member] | Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 160,814 | 156,588 | 614,374 | 539,841
Instruments [Member] | Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 15,500 | 0 | 58,000
Instruments [Member] | CHINA |  |  |  |
Product sales, net | 0 | 78,000 | 0 | 228,000
Instruments [Member] | CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 0 | 78,000 | 0 | 228,000
Instruments [Member] | CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Handpieces [Member] | Domestic [Member] |  |  |  |
Product sales, net | 820,133 | 802,916 | 1,623,542 | 1,606,050
Handpieces [Member] | Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 801,533 | 802,916 | 1,597,392 | 1,597,900
Handpieces [Member] | Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 18,600 | 0 | 26,150 | 8,150
Handpieces [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 479,799 | 715,124 | 1,403,751 | 1,689,459
Handpieces [Member] | Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 459,799 | 709,624 | 1,383,751 | 1,663,559
Handpieces [Member] | Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 20,000 | 5,500 | 20,000 | 25,900
Handpieces [Member] | CHINA |  |  |  |
Product sales, net | 0 | 447,336 | 359,964 | 804,336
Handpieces [Member] | CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 0 | 447,336 | 359,964 | 804,336
Handpieces [Member] | CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Accessories [Member] | Domestic [Member] |  |  |  |
Product sales, net | 22,621 | 18,974 | 47,481 | 36,882
Accessories [Member] | Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 22,621 | 18,974 | 47,481 | 36,882
Accessories [Member] | Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Accessories [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 9,973 | 12,548 | 22,162 | 33,109
Accessories [Member] | Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 9,973 | 12,548 | 22,162 | 33,109
Accessories [Member] | Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 |
Accessories [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Accessories [Member] | CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Accessories [Member] | CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | $ 0 | $ 0 | $ 0 | $ 0

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